Ball-mile.



F. E. MARGY.

BALL MILL.

APPLIGATION HLED PEB. zo, 191s.

F. E. MARGY.

BALL MILL.

APPLICATION FILED IEB.26.1913.

SQ Patfented B61191913 W1 TNESSES IN VENTOR.

` BY `iXi/UML ATTORNEY.

tate about its aXis and its ore and pebble contents will be tumbledabout. The balls or crushing bodies are represented by the referenceletter b and. the ore or chargel proper by the letter m., the fines orgranular particles representing the inal product of the mill and readyto be discharged therefrom, being` represented by m. The Segregation ofthe fine from the coarse particles and their automatic migration towardthe discharge end of the mill during the grind-1 ing and tumblingoperation, yis accomplishedl by what l term a sorting drum or colfy umnl11 the drawings illustrating two formsy of construction of the drum.This dr/um is located within the crushing compartment of the mill, beingsymmetrically disposed about the rotation axis of the mill and occupiesa position adjacent the discharge-head e. ln the main form this sortingdrum or member is composed of several sections (four in the presentillustration) collectively forming when assembled a hollow truncatedcone, the base of the cone resting in an annular groove e formed for itsreception in the terminal wall h. of a cylindrical platform 12 cast withthe head 4l and disposed about the axis of the trunnion 10, the walls ofthe member l2 being provided with oblong openings O for the free passagetherethrough of the material discharged from the mill. Stretched acrossthe annular space between the base of the sorting member 1l and the endof the tube 1 is a wire-mesh screen or sieve 13 (about 2O mesh) theopposite edges of said annular screen being secured to the tube wall,and to the base -of the sorting member respectively, in any convenientor suitable mechanical manner. The several sections of the sorting drumare preferably secured in position by means of--bolts 14 passedrespectively through lugs 15 onthe drum sections, through the wall h andthrough the head 4, the nuts n being on the outside whereby the partsmay at any time be tightened. The member 1l is further supported by acentral tubulcr brace or strut 16 bearing with its free end against theconverging ends of the several sections of the sorting drum, the fixedend of the brace beling screwed into a central boss 17 formed on theWall' ZL of the platform 12..y By the ,arrangement just described itwill be seen that the securing' means for the sorting member are outoffthe way ofthe mill con tents. and'thus do not in any way ,interferewith the free movementpf the materials'in,vr

yj' The operation 'of the mill can be best.describedfin'connection--with Athe illustration in Fig. 2 towhichreference will be made. ln

this figure, the-tube 1 isrotating clockwise 4. (if wel look toward theright}.tha t is to sag the upper portion. is revolvmg'towai'dthe,

lobserver and 'the bottom portion from the noem/ee observer. As statedat the outset, in order that there may be perfect grinding or crushingthere must be a constant migration of the ore particles from the feedtoward the discharge end, the particle first entering the mill being thefirst to leave the mill. l/Vithout the sorting member 11 or itsequivalent there is no assurance that the particles will leave in theorder in which they enter the mill and so a uniform (granular) ,productis practically impossible. Where water is resorted to to eiiect the`migration aforesaid,` such migration will be imparted only to the veryfinest slimes, but in 'the ordinary standard sliming mill that isiifteen feet long and half full of pebbles and ore .there would be ivery little velocity of the waterthroughthe 1 pebbles, and the carryingpower ofthe cur- I rent is very small. lilith the use of the sortingmember 11 the pebbles will be higher atone end of the mill than at theother, and as the mill revolves there results a leveling acltion and aconsequent migration, the mate- Q rial migrating consisting of pebblesand ore (coarse and fine. lt is a well known fact 'that if we dump amine car of ore or mine -waste over a dump, the big roc-ks all rattle atthe bottom and the fines remain by the tracks. So in my mill, if wecause a migration of the particles and have them higher at one end thanat the other, the fines tend ,to remain at the high end and close tothedischarge opening, the coarser particles gravitating to lower planes orlevels. -ln this way a perfect separation of granular particles from therest of the ore and pebbles is made possible.v The presence of thesorting member 11 therefore has the eii'ect of .raising the pebbles to ahigher level at one end (the discharge end) than at the other, suchraising causing a' higher pressure of the pebbles in that particularZone. In addition to that, the rolling action of the pebbles vand theirmovement is nolonger around an axis parallel to the axis of rotation ofthe mill itself, but the pebbles tend toroll and l grind and revolveabout axes at various angles to the axis of the mill. Along the im lmediate 'planes of section4 indicated by section lines l-4, 7-l7,/inFig. 2, and in fact in the, zone between the headv 3 and the adjacentterminalfo/f Athe member 11, the ore and pebbles assume a positionrepresented by the material in Fig. 4;. in the zone in the region of theplane of'section indicated by section line 5-5, the material disposesitself substantiallyas shown in Fig. 5. Near thpoint pf' discharge. andin the zone in the region` of the section line-6- -6,"the materal'dis-'fposes itself substantially as shown Jin Fig. 6, Fig .7 representing theprojectionoftheen tirebody of ore to the right offsectlion-line.7-7,'.so that the orewhich is dis osed,v along the plane of the section.line 7- proper is merged with the body of ore beyond the sec' iso i 55The sorting drum nee mst necessmfl mug.

5 dschaxge yand 1G, s @fr one. ik@ otxef han A migration o: cunte i1-@tides. and paboles iov; conical of @paying Soi 7 40 counter trend does ndsurb the lhase being left te pass th'zfmgh th scm@ (which prevents any@Gafsa parces xot :fel ih tuned m@ he zm, from passmg; mi@ me i trmmwnin the Zone @tween fue head wl e 5@ migration "being mosy confinedbetWQe-n the drum 11. @i Qomse as zesh @are is fed n migra# of n-es-'gcWa-d fromvhe hoppa? it take@ the phase that en.

isfe about af Crushing' gp s comma comp @,rtm en and havimg Mavn0 povsonfor screen. @hay fcms wl suggest memseives to the skfl mechanic.

l converging fromv the discharge toward the intake end of the vessel,whereby the coarse particles are caused to migrate away from thedischarge end.

6. In combination with a tubular vessel rotating about its axis andprovided with intake and discharge openings for the material at oppositeends of the axis, a sorting member disposed about said axis andpositioned adjacent the discharge opening and spaced from the innerwalls of the vessel, the walls of the sorting member c mverging from thedischarge toward the intake end ot the vessel, and operating tosegregate the ines from the coarse particles and direct such finestoward the discharge opening.

7. In combination with a tubular axially rotatable tumbling vesselprovided with terminal heads having central intake and dischargeopenings respectively, a sorting drum disposed about the rotation axisof the vessel-adjacent 'the discharge head thereof, the

walls of the drum converging from said discharge headdidward lthc axiset' the vessel and spaced from the inner walls of the vessel, means forestablishing intercommunication between the discharge opening and thespace between the drum and .inner walls of the vessel, the drumoperating to segregate the fines from the coarse particles, and cause amigration of said inestoward the discharge opening whereby the materialflows through said intercommunicating means into the discharge opening.

8. In combination with atribular axially rotatable tumbling vesselprovided with terminal heads having central intake and diS- chargeopenings respectively, a sorting drum disposed about the rotation axisof the vessel adjacent the discharge head thereof, the walls of the drumconverging from said discharge head toward the axis of the vessel, andspaced from the inner walls of the vessel, means for establishingintercommunication between the discharge opening and the space betweenthe drum and inner walls of the vessel, the drum operating to segregatethe fines from the coarse particles and cause a migration of said finestoward the disel'iargc opening, and a flow thereof through saidintercommunicating means into the discharge opening, and a screeninterposed in the path of flow or' said ines.

9. ln combination with a tumbling barrel having a head provided with acentral discharge opening, a platform surrounding said opening andprovided `with peripheral openings for the flow of the finestherethrough, a sorting drum secured to said platform and having wallstapering away from said discharge opening and operatingto cause amigration of the fines toward the openings of the platform. y

10. In combination with a tumbling barrel having a head provided with acentral discharge means, a hollow platform on said head located in thebarrel and provided with peripheral openings for the How of the finestherethrough to the discharge means, a sort ing drum on the platformhaving walls tapering away from said discharge means, and a screendisposed about the base of the drum and interposed between the latterand the walls of the barrel.

` In testimony whereof I aHiX my signature, vin presence of twoWitnesses.

